PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment
Total	$ 7,597,352	$ 6,885,092
Less: Accumulated depreciation and amortization	(1,487,713)	(1,388,217)
Property, plant and equipment — net	6,109,639	5,496,875
Regulated Operating Subsidiaries
Property, Plant and Equipment
Property, plant and equipment in service	7,085,818	6,396,449
Construction work in progress	425,594	391,788
Capital equipment inventory	54,781	68,170
Other	12,550	13,151
ITC Holdings and Other
Property, Plant and Equipment
ITC Holdings and other	$ 18,609	$ 15,534